Add some plumbing for in-progress work on enabling SSL proxy support....

net/proxy/proxy_server.cc

Index: net/proxy/proxy_server.cc
===================================================================
--- net/proxy/proxy_server.cc	(revision 52951)
+++ net/proxy/proxy_server.cc	(working copy)
@@ -34,6 +34,8 @@
     return ProxyServer::SCHEME_SOCKS5;
   if (LowerCaseEqualsASCII(begin, end, "direct"))
     return ProxyServer::SCHEME_DIRECT;
+  if (LowerCaseEqualsASCII(begin, end, "https"))
+    return ProxyServer::SCHEME_HTTPS;
 
   return ProxyServer::SCHEME_INVALID;
 }
@@ -53,6 +55,8 @@
     return ProxyServer::SCHEME_SOCKS5;
   if (LowerCaseEqualsASCII(begin, end, "direct"))
     return ProxyServer::SCHEME_DIRECT;
+  if (LowerCaseEqualsASCII(begin, end, "https"))
+    return ProxyServer::SCHEME_HTTPS;
   return ProxyServer::SCHEME_INVALID;
 }
 
@@ -132,6 +136,8 @@
       return std::string("socks4://") + host_and_port();
     case SCHEME_SOCKS5:
       return std::string("socks5://") + host_and_port();
+    case SCHEME_HTTPS:
+      return std::string("https://") + host_and_port();
     default:
       // Got called with an invalid scheme.
       NOTREACHED();
@@ -180,6 +186,8 @@
       return std::string("SOCKS ") + host_and_port();
     case SCHEME_SOCKS5:
       return std::string("SOCKS5 ") + host_and_port();
+    case SCHEME_HTTPS:
+      return std::string("HTTPS ") + host_and_port();
     default:
       // Got called with an invalid scheme.
       NOTREACHED();
@@ -195,6 +203,8 @@
     case SCHEME_SOCKS4:
     case SCHEME_SOCKS5:
       return 1080;
+    case SCHEME_HTTPS:
+      return 443;
     default:
       return -1;
   }